The Experts below are selected from a list of 87666 Experts worldwide ranked by ideXlab platform
Zhongbao Shao - One of the best experts on this subject based on the ideXlab platform.
-
Preparation of LiFePO4/C via high-temperature Ball-Milling route and Box-Behnken design-based optimization
Ionics, 2019Co-Authors: Xuetian Li, Hongmei Shao, Lina Yu, Zhongcai Shao, Chuang Li, Zhongbao ShaoAbstract:LiFePO4/C cathode material was prepared via high-temperature Ball-Milling route with ultrasonic dispersion as mixing process using eutectic molten salt (0.76 LiOH·H2O-0.24 Li2CO3) as lithium source. Box-Behnken design was used to study the combined effects of ultrasonic time, Ball-Milling temperature, and Ball-Milling time on the discharge capacity to obtain the optimum predicted conditions. The optimum conditions were as follows: ultrasonic time was 63 min, Ball-Milling temperature was 638 °C, and Ball-Milling time was 7 h. LiFePO4/C prepared from the optimized experimental conditions exhibited a well electrochemical performance; its discharge capacity was 161.3 mAh g−1 at a 0.1 C-rate which was in consistence with the predicted discharge capacity of 160.2 mAh g−1. Moreover, its capacity retention rate achieved 93.6% at a 10 C-rate over 100 cycles.
-
Influence of Temperature on the Performance of LiNi1/3Co1/3Mn1/3O2 Prepared by High-Temperature Ball-Milling Method
Advances in Materials Science and Engineering, 2018Co-Authors: Ming Tian, Xuetian Li, Zhongbao Shao, Fengman ShenAbstract:Aiming at the preparation of high electrochemical performance LiNi1/3Co1/3Mn1/3O2 cathode material for lithium-ion battery, LiNi1/3Co1/3Mn1/3O2 was prepared with lithium carbonate, nickel (II) oxide, cobalt (II, III) oxide, and manganese dioxide as raw materials by high-temperature Ball-Milling method. Influence of Ball-Milling temperature was investigated in this work. It was shown that the fine LiNi1/3Co1/3Mn1/3O2 powder with high electrochemical performance can be produced by the high-temperature Ball-Milling process, and the optimal Ball-Milling temperature obtained in the current study was 750°C. Its initial discharge capacity was 146.0 mAhg−1 at the rate of 0.1 C, and over 50 cycles its capacity retention rate was 90.2%.
-
pretreatments assisted high temperature Ball Milling route to li4ti5o12 and its electrochemical performance
Materials Letters, 2014Co-Authors: Zhongbao ShaoAbstract:Abstract Spinel Li4Ti5O12 was synthesized via a high temperature Ball Milling route with the assistance of ultrasonic dispersion, mechanical agitation, and glucose monohydrate solid phase dispersant, respectively. The crystal structures and the electrochemical properties of the as-prepared Li4Ti5O12 were systematically investigated. The results showed the as-prepared samples were highly-crystalline and exhibited high capacities and good cycle stabilities. The initial discharge capacity of sample C5 mixed with 5% glucose monohydrate reached 187.003 mA h/g at 0.1 C-rate, and retained at 183.509 mA h/g after 20 cycles. This facile solid phase dispersant-assisted high temperature Ball Milling method could be an excellent way to synthesize Li4Ti5O12 for practical applications.
Tiejun Wang - One of the best experts on this subject based on the ideXlab platform.
-
Enhanced Sugar Alcohol Production from Cellulose by Pretreatment with Mixed Ball-Milling and Solid Acids
Bioresources, 2016Co-Authors: Longlong Ma, Tiejun WangAbstract:Efficient pretreatment is the key step in catalytic biomass conversion. Herein, a mixed Ball-Milling method was used to pretreat cellulose with a solid catalyst. The method was tested with solid acid and commercial 5 wt% Ru/C in water, and the effect of pretreatment on yield was measured by the hydrolytic-hydrogenation of cellulose to sugar alcohols, which are the platform compounds for the production of gasoline and fine chemicals. The influence of Ball-Milling mode, time, and reaction parameters was studied. The properties of cellulose and the catalyst were also analyzed before and after treatment. The yield of sugar alcohols reached 90.3% at 463 K with amorphous zirconium phosphate (ZrP) and Ru/C and a mixed Ball-Milling time of 2 h. The high sugar alcohol yield was achieved 12 times faster than with the single Ball-Milling method under the same reaction conditions for 24 h. This effect is ascribed to the enhanced contact between cellulose and catalyst, which promotes the rate-determined cellulose depolymerization to obtain high sugar alcohols yield.
-
process intensification effect of Ball Milling on the hydrothermal pretreatment for corn straw enzymolysis
Energy Conversion and Management, 2015Co-Authors: Zhengqiu Yuan, Jinxing Long, Tiejun Wang, Riyang Shu, Qi ZhangAbstract:Enhancement of the cellulose accessibility is significant for biomass enzymatic hydrolysis. Here, we reported an efficient combined pretreatment for corn straw enzymolysis using Ball Milling and dilute acid hydrothermal method (a mixture solvent of H2O/ethanol/sulfuric acid/hydrogen peroxide liquid). The process intensification effect of Ball Milling on the pretreatment of the corn straw was studied through the comparative characterization of the physical-chemical properties of the raw and pretreated corn straw using FT-IR, BET, XRD, SEM, and HPLC analysis. The effect of the pretreatment temperature was also investigated. Furthermore, various pretreatment methods were compared as well. Moreover, the pretreatment performance was measured by enzymolysis. The results showed that Ball Milling had a significant process intensification effect on the corn straw enzymolysis. The glucose concentration was dramatically increased from 0.41 to 13.86 mg mL(-1) after the combined treatment of Ball Milling and hydrothermal. The efficient removal of lignin and hemicellulose and the enlargement of the surface area were considered to be responsible for this significant increase based on the intensive analysis on the main components and the physical-chemical properties of the raw and pretreated corn straw. (C) 2015 Elsevier Ltd. All rights reserved.
-
promoting hydrolytic hydrogenation of cellulose to sugar alcohols by mixed Ball Milling of cellulose and solid acid catalyst
Energy & Fuels, 2014Co-Authors: Yuhe Liao, Jinxing Long, Tiejun Wang, Qi Zhang, Yuping LiAbstract:Enhancing the contact or interaction between cellulose and solid catalyst is a significant aspect in its efficient catalytic conversion. Herein, mixed Ball Milling of cellulose and solid catalyst was presented to achieve this goal, and the promotion effect was measured by hydrolytic hydrogenation of cellulose to sugar alcohols (the platform compounds for biogasoline) with solid acid and commercial 5 wt % Ru/C in water. The effects of Ball-Milling modes, time, and reaction parameters were studied. The properties of cellulose and solid acid catalyst before and after treatment were also analyzed. The yield of sugar alcohols reached 90.3% at 463 K with amorphous zirconium phosphate and Ru/C (mixed Ball-Milling time of 2 h). This high yield of sugar alcohols achieved in the mixed Ball-Milling time of 2 h was 12 times faster than that by the single Ball Milling of 24 h under the same reaction conditions. It is ascribed to the enhanced contact between cellulose and catalyst, resulting in promoting cellulose depo...
Yuping Li - One of the best experts on this subject based on the ideXlab platform.
-
promoting hydrolytic hydrogenation of cellulose to sugar alcohols by mixed Ball Milling of cellulose and solid acid catalyst
Energy & Fuels, 2014Co-Authors: Yuhe Liao, Jinxing Long, Tiejun Wang, Qi Zhang, Yuping LiAbstract:Enhancing the contact or interaction between cellulose and solid catalyst is a significant aspect in its efficient catalytic conversion. Herein, mixed Ball Milling of cellulose and solid catalyst was presented to achieve this goal, and the promotion effect was measured by hydrolytic hydrogenation of cellulose to sugar alcohols (the platform compounds for biogasoline) with solid acid and commercial 5 wt % Ru/C in water. The effects of Ball-Milling modes, time, and reaction parameters were studied. The properties of cellulose and solid acid catalyst before and after treatment were also analyzed. The yield of sugar alcohols reached 90.3% at 463 K with amorphous zirconium phosphate and Ru/C (mixed Ball-Milling time of 2 h). This high yield of sugar alcohols achieved in the mixed Ball-Milling time of 2 h was 12 times faster than that by the single Ball Milling of 24 h under the same reaction conditions. It is ascribed to the enhanced contact between cellulose and catalyst, resulting in promoting cellulose depo...
Lin Ge - One of the best experts on this subject based on the ideXlab platform.
-
effects of Ball Milling time on microstructure evolution and optical transparency of nd yag ceramics
Ceramics International, 2014Co-Authors: Jiang Li, Maxim Ivanov, Yong Yuan, Min Chen, Lin GeAbstract:Abstract Polycrystalline Nd:YAG ceramics were fabricated by the solid-state reaction and vacuum sintering method using Y2O3, α-Al2O3 and Nd2O3 as starting powders. These powders were mixed in ethanol doped with MgO and TEOS and Ball milled for different time periods. The samples were sintered from 1500 °C to 1760 °C for 0.5–20 h. Effects of Ball Milling time on the particle size of powder mixtures as well as ceramics densification process, microstructure evolution and optical transparency of the as-prepared Nd:YAG ceramics were mainly investigated. It was demonstrated that coarse powders can be ground into fine particles. Porosities of Nd:YAG ceramics sintered at 1600 °C and 1760 °C decrease with the increase of Ball Milling time up to 12 h and are kept almost unchanged with further increasing the time. Contamination of the powders with impurities, which may not be observed in microstructures, when the Ball Milling time is overlong, and the very few residual micro-pores, will cause an infinitesimal decrease in transmittance. The grain growth kinetics of Nd:YAG ceramics fabricated from the optimal Ball Milling process was also studied in this paper. The highest in-line transmittance of 83% at 1064 nm was obtained by sintering the sample at 1760 °C/3 h from the powder mixtures Ball milled for 12 h.
Yong Yuan - One of the best experts on this subject based on the ideXlab platform.
-
effects of Ball Milling time on microstructure evolution and optical transparency of nd yag ceramics
Ceramics International, 2014Co-Authors: Jiang Li, Maxim Ivanov, Yong Yuan, Min Chen, Lin GeAbstract:Abstract Polycrystalline Nd:YAG ceramics were fabricated by the solid-state reaction and vacuum sintering method using Y2O3, α-Al2O3 and Nd2O3 as starting powders. These powders were mixed in ethanol doped with MgO and TEOS and Ball milled for different time periods. The samples were sintered from 1500 °C to 1760 °C for 0.5–20 h. Effects of Ball Milling time on the particle size of powder mixtures as well as ceramics densification process, microstructure evolution and optical transparency of the as-prepared Nd:YAG ceramics were mainly investigated. It was demonstrated that coarse powders can be ground into fine particles. Porosities of Nd:YAG ceramics sintered at 1600 °C and 1760 °C decrease with the increase of Ball Milling time up to 12 h and are kept almost unchanged with further increasing the time. Contamination of the powders with impurities, which may not be observed in microstructures, when the Ball Milling time is overlong, and the very few residual micro-pores, will cause an infinitesimal decrease in transmittance. The grain growth kinetics of Nd:YAG ceramics fabricated from the optimal Ball Milling process was also studied in this paper. The highest in-line transmittance of 83% at 1064 nm was obtained by sintering the sample at 1760 °C/3 h from the powder mixtures Ball milled for 12 h.
